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\ ˈüf 
\
\Definition of oof
—used to express discomfort, surprise, or dismayI once watched a highlight reel of Tyson knockouts with a roomful of intoxicated medical students who punctuated every blow with phrases like "Oof! I can't believe that dude's sternum didn't just collapse."— Diane Vadino
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Merriam-Webster unabridgedWords at Play
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Time Traveler for oof
The first known use of oof was in 1777
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